If Compound A (C₄H₈) is treated with H₂O/H₂SO₄ and forms an optically inactive C₄H₁₀O, what is the structure of A?

1.	CH3CH2CH=CH2	2.	CH3CH=CHCH3
3.	(CH3)2C=CH2	4.

 
Compound A is:

1.		2.
3.		4.

The major product in the above-mentioned reaction is:

1.
2.
3.
4.

Arrange the following compounds in increasing order of their reactivity toward electrophilic aromatic substitution reactions.

In the following reaction,

\(\mathrm{ CH_{3}C\equiv CH\xrightarrow[Red \ hot \ iron \ tube]{873 K} \ A}\)

The number of ($\sigma$) bonds present in the product (A) is:

3-Phenylpropene on reaction with HBr gives (as a major product)-

1. $C_6{H}_{5}CH\left(Br\right)C{H}_2-C{H}_3$

2. ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{CH}}_2\mathrm{CH}\left(\mathrm{Br}\right){\mathrm{CH}}_3$

3. ${\mathrm{C}}_6{\mathrm{H}}_4\left(\mathrm{Br}\right)<mspace\; width="1em"></mspace>{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_3$

4. ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{Br}$

1,2-dibromopropane on treatment with X moles of ${\mathrm{NaNH}}_2$ followed by treatment with ethyl bromine gave a pent-2-yne. The value of X is:

1.  1

2.  2

3.  3

4.  4

  
The product X in the above mentioned reaction is:

1.		2.
3.		4.

The reaction among the following that proceeds through an electrophilic substitution reaction is:

1.
2.
3.
4.

The most suitable reagent for the following conversion is-